Effect of Ar Bubbling on Removal Rate of Alumina Inclusion in Al Deoxidized Steel

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  • KIM Jeong-Sik
    Graduate Student, Toyohashi University of Technology, now Tokyo Research Laboratories Pohang Iron & Steel Co. LTD.
  • KAWAKAMI Masahiro
    Toyohashi University of Technology
  • TANIDA Kouji
    Graduate Student, Toyohashi University of Technology, now Daido Steel Co., Ltd.

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Other Title
  • アルミナ介在物の除去速度におよぼすArバブリングの効果
  • アルミナ カイザイブツ ノ ジョキョ ソクド ニ オヨボス Ar バブリング

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Description

Effect of Ar bubbling on the deoxidation rate of molten steel with Al has been investigated in 20 kg scale induction furnace. The results are summarized as :<BR>(1) The deoxidation was completed within 5 to 15 min depending on experimental conditions. The final total oxygen content was 30 to 45 ppm.<BR>(2) The deoxidation model has been proposed in which deoxidation rate should be determined by the balance of removal and reentrainment rates of alumina inclusion.<BR>(3) The removal rate constant was obtained at each condition. The apparent activation energy was obtained as 284, 355, 368 kJ/mol, respectively with Ar flow rate of 0, 5, 10 l(STP)/min.<BR>(4) The removal rate constant was expressed as a function of total stirring energy density for induction stirring(εind)and Ar gas stirring(εB/B), namely, k=k1(εind+εB/B)n.The value of n was obtained as 0.50 to 0.65.<BR>(5) The contribution of entrapment of inclusion in bubbles was estimated quantitatively. The transfer coefficient of inclusion migration to bubble was also estimated.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 81 (3), 167-172, 1995

    The Iron and Steel Institute of Japan

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